Decompressive cystocentesis in the blocked cat: when and how
7-year-old male cat blocked for two days, depressed and with a very distended bladder. While he is being stabilised with fluids and his hyperkalaemia corrected, the team discusses whether to tap the bladder.
Which statement about decompressive cystocentesis is correct?
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A. It is always contraindicated because it frequently causes bladder rupture and uroabdomen
In published studies serious complications are uncommon; there may be a small leak of urine into the abdomen, without clinical consequences in most cases.
B. If the bladder is emptied well, the cat no longer needs to be catheterised
The urethral obstruction persists and the bladder refills within hours. Cystocentesis is a temporary measure that does not resolve the cause.
C. Using a fine needle, extension set and three-way tap and emptying the bladder as fully as possible relieves pressure, provides a urine sample and may make catheterisation easier
Correct. It reduces pain and back-pressure on the kidneys while the cat is stabilised, and lower bladder pressure usually makes retrohydropulsion easier. It is done with a single puncture, without moving the needle inside the bladder.
D. Only a small amount of urine should be removed so the bladder does not collapse
If little is removed, the bladder remains tense and urine may leak through the puncture site. The aim is to empty it almost completely.
lightbulb Key takeaway
Decompressive cystocentesis is useful while stabilising a very sick cat or if catheterisation will be delayed. Use a single puncture and empty the bladder fully, and remember that catheterisation is still needed.
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Updated: October 31, 2026 · Educational content for veterinary professionals. It does not replace current clinical guidelines or the judgement of the attending veterinarian.